Breaking News
Comments
Newest First | Oldest First | Threaded View
<<   <   Page 4 / 4
Max The Magnificent
User Rank
Author
re: Three puzzles to ponder
Max The Magnificent   1/13/2011 2:50:17 PM
NO RATINGS
Hi there -- when I said "the first one" I meant the first one posed by KarlS -- in the case of my three, the first one is easy -- as you say the answer is independent of the size of the planet (my specifying the diameter was a "red-herring") -- but you'd be amazed how many folks have difficulty with this one until you explain it (which I don;t want to do here so as to not give the game away)

richardst
User Rank
Author
re: Three puzzles to ponder
richardst   1/13/2011 2:14:03 PM
NO RATINGS
Re: Puzzle 2. As an engineering approximation, assume that the tank has a hexagonal cross-section. Hence, mark 1/6 full 1/4 way up the stick, 1/3 at 3/8, 1/2 at 1/2, 2/3 at 3/8, and 5/6 full at 3/4. That should do for a start. Otherwise, invert the formula for a circlar sector. I like KarlS's first puzzle. Solve t - 1 = t!

Radionut
User Rank
Author
re: Three puzzles to ponder
Radionut   1/13/2011 8:26:52 AM
NO RATINGS
Hello Max, as David states, problem no. 1 is easy: the answer is independent of the size of the planet be it 20km or 20cm or 20 million miles.

Max The Magnificent
User Rank
Author
re: Three puzzles to ponder
Max The Magnificent   1/12/2011 2:59:19 PM
NO RATINGS
Dang, I thought the first one would be easy .. maybe it is but as soon as i start noodling on it some crisis comes up and I get dragged away...

KarlS
User Rank
Author
re: Three puzzles to ponder
KarlS   1/11/2011 8:30:37 PM
NO RATINGS
If one car starts out at 30 mph and a second starts out an hour later at 60 mph, how long before the second car has gone twice as far as the first? (ignore acceleration time). At what times are the hands on a clock pointing in exactly opposite directions?

David Ashton
User Rank
Author
re: Three puzzles to ponder
David Ashton   1/11/2011 8:01:32 AM
NO RATINGS
Right on Glen, I spent far too much of my work day sorting those out......

zeeglen
User Rank
Author
re: Three puzzles to ponder
zeeglen   1/11/2011 2:30:16 AM
NO RATINGS
Assuming a balance beam scale (with counterweights) for puzzle #3 makes the math very easy. Exactly 100 Kg. A strain gauge scale takes some brain sweat with centripetal force calculations. 99.67 Kg ? #2 14.9 cm and 35.1 cm ? Circle segment area geometry, not calculus. Chords and arcs and all that neat stuff long since forgotten. Thank goodness for Wikipedia. Now my head hurts... These are interesting puzzles. Looking forward to more.

David Ashton
User Rank
Author
re: Three puzzles to ponder
David Ashton   1/10/2011 10:13:00 PM
NO RATINGS
Hi Max. Ref problem no. 1. The answer is easy, I won't give it away though, but the main problem that occurs to me is, how are you going to drive the wooden sticks into your stainless steel planet? I think No. 2 requires calculus, which I tried to relearn recently, this would be a good test of my knowledge...

Max The Magnificent
User Rank
Author
re: Three puzzles to ponder
Max The Magnificent   1/10/2011 8:42:25 PM
NO RATINGS
If you've got any good puzzles of this ilk, please email them to me at max@CliveMaxfield.com and I'll use them in a future blog...

<<   <   Page 4 / 4


Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
Radio
LATEST ARCHIVED BROADCAST

What are the engineering and design challenges in creating successful IoT devices? These devices are usually small, resource-constrained electronics designed to sense, collect, send, and/or interpret data. Some of the devices need to be smart enough to act upon data in real time, 24/7. Specifically the guests will discuss sensors, security, and lessons from IoT deployments.

Brought to you by:

Like Us on Facebook
Special Video Section
The LTC2380-24 is a versatile 24-bit SAR ADC that combines ...
In this short video we show an LED light demo to ...
02:46
Wireless Power enables applications where it is difficult ...
07:41
LEDs are being used in current luxury model automotive ...
With design sizes expected to increase by 5X through 2020, ...
01:48
Linear Technology’s LT8330 and LT8331, two Low Quiescent ...
The quality and reliability of Mill-Max's two-piece ...
LED lighting is an important feature in today’s and future ...
05:27
The LT8602 has two high voltage buck regulators with an ...
05:18
Silego Technology’s highly versatile Mixed-signal GreenPAK ...
The quality and reliability of Mill-Max's two-piece ...
01:34
Why the multicopter? It has every thing in it. 58 of ...
Security is important in all parts of the IoT chain, ...
Infineon explains their philosophy and why the multicopter ...
The LTC4282 Hot SwapTM controller allows a board to be ...
This video highlights the Zynq® UltraScale+™ MPSoC, and sho...
Homeowners may soon be able to store the energy generated ...
The LTC®6363 is a low power, low noise, fully differential ...
See the Virtex® UltraScale+™ FPGA with 32.75G backplane ...
Vincent Ching, applications engineer at Avago Technologies, ...